Spring base furniture



1932- L. LARSEN SPRING BASE FURNITURE Filed Feb. 26, 1951 Patented Aug. 30, 1932 UNITED STATES PATENT OFFICE LEWIS LARSEN, OF MENOMINEE, MICHIGAN, ASSIGNOR TO HEYWOOD-WAKEFIELD COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS SPRING BASE FURNITURE REISSUED Application filed February 26, 1931. Serial No. 518,358.

This invention relates to improvements in spring base furniture and it consists of the matters hereinafter described and more particularly pointed out in the appended claims.

The primary object of the invention is to provide a simple and efficient spring base for chairs and other articles of furniture made from a single length of stock and including a U-shaped floor engaging portion, each side member of which is curved to provide the flexible part of the base where it is of a flat cross section and is then extended rearwardly for attachment to the seat frame of the chair.

Another object of the invention is to so form the floor engaging members of the base as to permit of a better spring action without inducing a lifting tendency to the front of the chair when occupied and used in the manner intended.

The above mentioned object of the invention as well as others, together with the many advantages thereof will more fully appear as I proceed with my specification.

. In the drawing Fig. 1 is a perspective view of a chair having a spring base embodying my invention. 7

Fig. 2 is a perspective view of a base embodymg my invention.

Fig. 3 is a detail vertical sectional view through one side of the seat frame illustrating the manner in which it is attached to the base, the plane of the section being indicated by the line 33 of Fig. 1.

In general the base comprises a member made of fiat spring stock and having a substantial U-shaped floor engaging part, the front end of the side members of which are being formed on a curve of about 180 so that the extremities of said members provide arms that face rearwardly and are adapted to have secured thereto the seat frame of a chair or the like.

Referring now in detail to that embodiment of the invention illustrated in the drawing and particularly to Fig. 1 thereof, the chair shown therein comprises a base 1 and a seat 2 with which is associated the back rest 3 and side arms 4.

The base 1 which is made of flat spring stock comprises a substantially U-shaped arms or members 55 connected together at their rear ends by a cross bar 6. The front end of each side member or arm is made as a curve 7 of about 180 in length and the extremity of each end extends rearwardly a suitable distance to provide seat frame engaging parts 8, that terminate short of the plane of the cross member 6. In this respect it is pointed out that the side members 55 not only converge slightly toward the cross bar 6 but are slightly bowed or arched upwardly between their ends as is apparent by the straight comparison line 5 in Fig. 2. The seat frame engaging parts 8 converge in a manner corresponding to said floor engaging members.

When the base. thus far described is employed in a chair, the seat 2 includes a bottom frame 9 of wood or the like. The side members 10 of such a seat frame are engaged upon the parts 8 of the base and bolts 11 are employed to secure them together. The back rest 8 and side arms 4 which form no particular part of the present invention, are supported from the seat frame in any suitable manner.

When such a seat is occupied, a roclnng movement takes place, due to the yielding flexing spring action of the curved parts 77 of the base. Due to the slight upward arching or bowing of the side members, in the flexing of the curved parts 7 the side members tend to straighten out and thus resist any lifting action of the front part of the base. This arrangement in connection with the cross bar 6 which is disposed in a plane to the rear of the seat frame effectively eliminates tipping over rearwardly of the chalr as when the occupant sets up a rocking movement therein.

It is essential in the invention that at least a part of the base be of a flat cross section and preferably such a cross section is formed in the curved parts. In this manner, a better rocking action is possible than if the entire base were made of tubing because when tubing is so used and especially in the curved parts, buckling is most apt to occur on the inside of the curve whereby crystallization of the metal is set up at this point with resulting loss of spring action and more often a break age.

Preferably the entire base is made of stock of a flat cross section as such stock is more readily formed to the desired shape than is tubing. Such flat cross section stock better resists any lateral swaying which would soon rack the seat frame out of shape.

By making the base separate from the seat, such abase may be easily replaced should breakage occur.

While in describing the invention, I have referred in detail to the form, arrangement and construction of the various parts thereof, the same is to be considered merely as illustrative so that I do not Wish to be limited thereto except as may be specifically set forth in the appended claims.

I claim as my invention 1. A base for an article of furniture embodying therein, upwardly bowed floor engaging side members connected together at their rear ends and rcarwardly extending seat frame engaging members spaced above said side members and each connected to the front end of an associated side member by a substantially semi-cylindrical curved part.

2. A base for an article of furniture made from a strip of flat spring stock and formed to provide upwardly bowed floor engaging side members connected together at their rear ends by a cross member, and rearwardly extending seat frame engaging parts spaced above said side members and terminating short of the plane of the cross member, each seat frame engaging part being connected to the front end of an associated side member by a curved part of substantially in armate length.

In testimony whereof, I have hereunto set my hand, this 23th day of February, 1931.

' LEWIS LARSEN. 

